As above i use a £45 latest fire 8. Works fine with fully, motion detection works well. Dont get me wrong id rather have full android to avoid the lock screen etc but i arnt getting that for £45 new so ye, pretty descent keep installed apps to a minimum as they can slow down , i use fully and tasker to monitor its own battery % and turns the charger on when its need as i never like the idea of having a battery always on charge